1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * AMD Node helper functions and common defines 4 * 5 * Copyright (c) 2024, Advanced Micro Devices, Inc. 6 * All Rights Reserved. 7 * 8 * Author: Yazen Ghannam <Yazen.Ghannam@amd.com> 9 * 10 * Note: 11 * Items in this file may only be used in a single place. 12 * However, it's prudent to keep all AMD Node functionality 13 * in a unified place rather than spreading throughout the 14 * kernel. 15 */ 16 17 #ifndef _ASM_X86_AMD_NODE_H_ 18 #define _ASM_X86_AMD_NODE_H_ 19 20 #include <linux/pci.h> 21 22 #define MAX_AMD_NUM_NODES 8 23 #define AMD_NODE0_PCI_SLOT 0x18 24 25 struct pci_dev *amd_node_get_func(u16 node, u8 func); 26 27 static inline u16 amd_num_nodes(void) 28 { 29 return topology_amd_nodes_per_pkg() * topology_max_packages(); 30 } 31 32 #ifdef CONFIG_AMD_NODE 33 int __must_check amd_smn_read(u16 node, u32 address, u32 *value); 34 int __must_check amd_smn_write(u16 node, u32 address, u32 value); 35 36 /* Should only be used by the HSMP driver. */ 37 int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write); 38 #else 39 static inline int __must_check amd_smn_read(u16 node, u32 address, u32 *value) { return -ENODEV; } 40 static inline int __must_check amd_smn_write(u16 node, u32 address, u32 value) { return -ENODEV; } 41 42 static inline int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write) 43 { 44 return -ENODEV; 45 } 46 #endif /* CONFIG_AMD_NODE */ 47 48 /* helper for use with read_poll_timeout */ 49 static inline int smn_read_register(u32 reg) 50 { 51 int data, rc; 52 53 rc = amd_smn_read(0, reg, &data); 54 if (rc) 55 return rc; 56 57 return data; 58 } 59 #endif /*_ASM_X86_AMD_NODE_H_*/ 60